arm64/mm: move runtime pgds to rodata

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Now that deliberate writes to swapper_pg_dir are made via the fixmap, we
can defend against errant writes by moving it into the rodata section.
Since tramp_pg_dir and reserved_ttbr0 must be at a fixed offset from
swapper_pg_dir, and are not modified at runtime, these are also moved
into the rodata section. Likewise, idmap_pg_dir is not modified at
runtime, and is moved into rodata.

Signed-off-by: Jun Yao <yaojun8558363@gmail.com>
Reviewed-by: James Morse <james.morse@arm.com>
[Mark: simplify linker script, commit message]
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Jun Yao 2018-09-24 17:56:18 +01:00 • committed by Catalin Marinas

parent 2330b7ca78

commit 8eb7e28d4c

2 changed files with 24 additions and 21 deletions

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12

arch/arm64/kernel/head.S

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33

arch/arm64/kernel/vmlinux.lds.S

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